Governing mechanism for compressors and exhausters.



S A. MOSS. CHANISM FOR COMPRESSORS AND EXHAUSTERS\ GOVERNING ME I APPLICATWN HLED MAR. 31, 1916 1,265,482. Patented May 7,1918. O- w Fig. 2.

Inventor; 4

Fig. I.

\ SanFOrd .7 1. Moss;

'- responsive to changes in a'condition of the "fluid handled, there is a tendency for them to over-regulate or hunt. I have discovered that-this can be eliminated by providing the governing mechanism with a stabilizing means which changes its effective ac the function of the depending arm 30 and' the Weight 31. When the governor moves the lever 17 the weight31 moves-on the arc tion with changes in the load, and this is of a circle having the pivot point 18 for its center. The are is indicated by the line A. This movement brings the weight nearer to or farther from the pivot point 18 and hence varies its action on the bell float 13. For example, for the range of the governor as shown, the weight will] vary in distance from the point 18 in passing from no load to full load by an amount indicated by the distance between the two dot and dash lines B and'C. The arrangement is such that the weight increases its effective action on the governor with increase in the load. In the case of a suction governor, as shown, this means that the suction decreases slightly with increase in the load. That 1s, at light load the suction is greater than at full load.

Expressed in terms of pressure, it means that the pressure in the suction conduit increases slightly with the load. be seen that as the load increases the effective action of the stabilizing weight 31 also increases since it is moved farther from the pivot point with each increase in load. By this means I obtain stable governing for all loads within the range of the governor. The action is quite analogous to that of an ordinary speed governor whose weights assume slightly diiferen't positions in passing from the no load to the full load position, and with which the speed decreases with increase in the load.

The speed governor 28 is normally inactive and for normal speeds the lever 27 and pivot point 29 are stationary. In case of excess speed, however, the governor 28 comes into service and assumes control of the turbine preventing any further increase in speed irrespective of the action of the suction governor. In other words, the speed governor acts as a speed limiting device as distinguished from a governor which controls the speed at all times. The action of the speed governor 28 on the valve mechanism Sis obvious and needs no further explanation.

A mechanism as just described, or a similar one, can be used as a constant pressure governor instead of a constant suction governor, as will be obvious, the only change It will thus required being to adjust the leverage arrangement so that changes in pressure produce the-opposite, effect on the regulating mechanism to that which they do in the case of a constant suction governor. This will be apparent when it is considered that with a constant pressure governor, increase 'in pressure means a decrease in load and vice versa, which is just opposite to that in the case ofa constant suction governor.

Referring now to Fig. '2', my invention is shown as applied to a constant volume governor. steam turbine, having a valve chesttl c0ntaining a suitable valve mechanism actuated i0 indicates a driving. motor, as a by a shaft 42 on which is fixed an operating arm 4C3."- 44'indicates a part of the casing of a. centrifugal compressor and 45 the intake conduit therefor. Located in the intake conduit is a float 46 that rises and falls with increaseand decrease in the rate of flow of air or gas through it. The float is mounted on a rod 47 that extends upwardly through the top of the casing and is connected to a tilting lever 18 which corresponds to lever 17 of Fig. 1. The tilting lever 1-8 is pivoted at 49 to a'bracket 50 mounted on a suitable portion of the machine. Connected to the lever 18 is an arm 51 that is connected to the arm 43 of the regulating mechanism by a rod On the one end of the lever &8 is is an adjustable weight 53 which may be moved along the lever 48 to set the mechanism for different flows, and on the other end is a depending arm 5-1 carrying a weight 55, these parts corresponding to the arm 30 and weight 31 of the mechanism shown in Fig. 1. The arm 54 is adjustable along the lever 48 and the weight 55 is adjustable on the arm 54:. 56 is a suitable dash-pot for steadying the movements of the mechanism. It will be understood that the valve gear for ihe turbine shown in Fig. 2 may comprise a suitable govcrnorarranged after the manner of that shown in Fig. 1 and operating in the same general manner.

The operation of the arrangement of Fi Qwillbe obvious from the description already given of Fig. 1. As the flow increases or decreases the float will assume a higher or lower position in the intake conduit, thus tilting the lever =18 about its fulcrum 49. This Willmove the stabilizing weight 55 so as to bring it farther from or closer to the pivot 49 thus varying its effective action.

It will be seen that in each of the arrangements shown, the stabilizing Weight may be set at Various heights so as to give variable amounts of difierenee between the suction, or pressure, or flow (as the case may be) at no load and at full load. With the stabilizing weight in its highest position there Will be the least ditlerence, but, of course, it -follows that at the same time the governing will be the least stable. 'With the stabilizing assassin weight in its. lowest positiom there will be the greatest difi'er'ence, but also the greatest amount of stability. In any particular case the adjustment Will be such as to give the stability desired.

In accordance with the provisions ofthe patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but

. I desire ie have it understood that the appaby Letters Patent of the United States, is

'ratus shown is only illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to secure 1. The combination of a compressor, a prime mover for driving it, a regulator for the prime mover, a governor which moves in response to changes in a condition of the fluid handled by the compressor, a lever having a depending arm rigidly connected thereto, said lever being moved by the governor, a weight carried by the depending arm, and means connecting the lever to the regulator.

2. The combination of a compressor, a prime rmver for driving it, apivoted lever which is aoved to regulate the admission of motive fluid to the prime mover, a depending arm rigidlv connected to the lever and carrying a Weight, and means re onsive to changes in a condition of the d iiid being handled by the compressor for moving the lever.

3. In a compressor set, the combination of a motor, a compressor driven thereby,

regulating mechanism for the motor, and means for operating it comprising a pivoted lever, means connecting the lever to the regulating mechanism, means for tilting the lever in response to variations in a condition of the fluid being handled by the compressor, a depending arm rigidly connected to the lever, and a Weight carried by the arm.

a. In a compressor set, the combination of a motor, a compressor driven thereby, regulating mechanism for the motor, means for operating it comprising a pivoted lever, means connecting the lever to the regulating mechanism, means for tilting the lever in response to variations in a condition of the fluid being handled by the compressor, a depending arm rigidly connected to the lever, and a Weight carried by the arm; and a speed governor also arranged to tilt the lever in case of excess speed.

5. In a compressor set, the combination of a motor, a compressor driven thereby, regulating mechanism for the motor, and means for operating it comprisinga pivoted lever, means connecting the lever to the regulating mechanism, a float connected to t e lever, means for subjecting the float to the pressure of the fluid on one side of the compressor, and a depending Weighted stabilizing arm rigidly connected to the lever.

6. In a compressor set, the combination of a motor, a compressor driven thereby, regulating mechanism for the motor, means for operating it comprising a pivoted lever, means connecting the lever to the regulating mechanism, an inverted bell float having a liquid seal, a rod connecting it to the lever, a conduit connecting the, interior of the float to the compressor, a depending arm rigidly connected to the lever, and a Weight carried by the arm.

in Witness whereof, I have hereunto set my hand this 16th day of March 1916.

' SANFORD A. MOSS. 

